Introduction To Dynamometer, Types & Working

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A dynamometer or dyno can be characterized as a gadget that is utilized to gauge torque and the rotational speed of a machine. This deliberate information can decide the brake power, speed and different parameters of the pivoting machine or a motor. A dyno, aside from estimating torque and power, can likewise be utilized as a proving ground for various sorts of motor-related exercises, for example, adjustment of motor administration controllers, a profound examination of burning conduct and tribology.


A dynamometer can be characterized into two kinds:

Power absorption dynamometer:

Power Absorption dynamometers measure and retain the power yield of the motor to which they are coupled. The power retained is generally scattered as warmth by some means.

Examples of intensity retention dynamometers are Prony brake dynamometer, Rope brake dynamometer, Eddy current dynamometer, Hydraulic dynamometer, and so forth.

Power transmission dynamometer:

In power transmission dynamometers the power is transmitted to the heap coupled to the motor after it is demonstrated on some scale. These are likewise called torque meters.

Classification of absorption dynamometers

  • Prony brake dynamometer:

It is the least difficult type of retention type dynamometer. It has two wooden hinders that are put on a pulley which is settled on the pole of the motor whose control is to be estimated.

The wooden squares are braced together with two arrangements of fasteners and nuts. To control the speed of pulley, the weight is balanced over a pulley with the assistance of a helical spring present between the nut and the upper square.


A long switch is joined to the upper square which conveys weight on its external end. This weight set on the switch adjusts the brake when emptied. At the point when the brake is to be connected, the appropriate weight is stacked on the external end of the switch and nuts are fixed till shaft of the motor keeps running at a consistent speed.

The development in view of the weight stacked on the external end of switch adjusts the development of frictional obstruction between the pulley and wooden square. The power consumed amid grinding is changed over into warmth which is the reason this dynamometer should be chilled off frequently.

The brake control recipe is given by-

Brake control (bp) = 2π NT, where T = Weight connected (W) × separate (l)

  • Rope brake dynamometer:

This gadget likewise measures the brake power and comprises of a few turns of rope that is twisted around the pivoting drum settled on the yield shaft. One end of the rope is associated with the stacking gadget and another conclusion to the spring balance.

The power is retained when rubbing is created among rope and drum. This sort of dynamometer is shoddy and can be made rapidly. Be that as it may, braking power isn’t precisely estimated because of progress in the contact coefficient of the rope with the adjustment in temperature.


Brake control is given by:

Brake control (bp) = π DN (W − S)

Where D is the measurement of drum brake

W is the heaviness of the heap

S is perusing in spring balance.

  • Eddy current dynamometer:

It involves a stator with a few electromagnets and a rotor plate combined with motor’s yield shaft made of steel or copper. At the point when the rotor is turned, a swirl current is delivered on account of an attractive transition set up by field current in the electromagnet.

This swirl current is dispersed in producing heat, along these lines it needs some cooling game plans. The torque is estimated with the assistance of a minute arm simply like in different sorts of ingestion dynamometer.

  • Hydraulic dynamometer:

It takes a shot at the rule of disseminating heat in the liquid erosion instead of dry grating. Its development is like that of the liquid haggle comprises of an impeller coupled to the yield shaft of the motor.

The impeller pivots inside a packaging loaded up with liquid. Because of the radial power which creates in the external packaging, it will in general turn alongside the impeller however its pivot is limited by the torque arm that bolsters weight balance.


The spring balance framework estimates the erosion produced between the impeller and liquid. The consistent stream of working liquid conveys the warmth disseminated in the water driven dynamometer. Additionally, to control the yield control in this sort of dynamometer, floodgate doors can be moved in or out to in part or entirely impede the streaming water among impeller and packaging.

Classification of transmission dynamometers-

  • Epicyclical train dynamometer

In epicyclical train dynamometer, between the prime mover and driven, an epicycle equip train is set to quantify the power transmitted. A goad outfit is critical to the motor shaft which pivots the counter clockwise way. In addition, a rakish rigging is keyed to the motor shaft and turns the counter clockwise way.

  • Belt transmission dynamometer

In this sort of dynamometer, pulleys are connected to the belt going through two pulleys that are set on a switch. This switch conveys dead weight toward one side and adjusting weight at another end.

  • Torsion dynamometer

At the point when the power is transmitted through the pole, there is a contort close to the driving end by a little edge in respect to the opposite end. In such case, a torsion dynamometer is utilized that estimates the power and edge of curve in the pole.


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